Exception calling subscribe callback: 'bytearray' object has no attribute 'get'

[an99990]

Description
Sending PointCloud2 message and trying to visualize it in FoxeGlove but keep getting rosbridge error message

[rosbridge_websocket-1] [ERROR] [1660225884.363841657] [rosbridge_websocket]: Exception calling subscribe callback: 'bytearray' object has no attribute 'get

ROS Version (echo $ROS_DISTRO): Ros2 Galactic
OS Version (grep DISTRIB_CODENAME /etc/lsb-release): Focal

Steps To Reproduce
Publish Pointcloud2 msg
launch rosbridge
connect with foxglove

Expected Behavior
see pointcloud

Actual Behavior
nothing to see

[ben-congram]

I was receiving a similar error message when trying to subscribe to a large PointCloud2 msg: [rosbridge_websocket]: Exception calling subscribe callback: 'bytes' object has no attribute 'get'. Increasing the value of the max_message_size parameter solved the issue for me.

[simon-eis]

I had a similar error message when trying to subscribe to a video stream.
[rosbridge_websocket]: Exception calling subscribe callback: 'bytes' object has no attribute 'get'
For me the solution was to downscale the videostream now everything works fine and i can visualize the videostream in foxglove studio. I did not test the fix with increasing max_message_size. The datarate of the original stream was 24.8 MB per image with 20 FPS this computes to 496 MB/s, which was obviously too much for the rosbridge.